Engine Oil coolers

[riotwarrior]

Well been thinking quite a bit about this addition of the Kubota diesel and a turbo to it. The engine is water cooled but not a pump fed system it's strictly a rad filled, sitting on the block filled and hot water from block and heads rise and cooler water sinks, there is a engine driven fan to force air through the rad as well.

The engine has a pressurized oil system with a spin on filter, and I"m thinking of adding on an external oil cooler to assist the cooling of the engine.

The engine is as we know set down in a tub and does not see much for air flow and I really want to add a cover to help quiet things down, I'd also add a separate cooler for the transmission as well to assist keeping it cooler.

Any thoughts on a good small engine oil cooler, anyone have experience with them?

Look forward to hearing from you all.

Al

[Cougar]

You should get a hold of Matt at Mudd-Ox he puts them on the Mudd-Oxs. I was up at he's place yesterday hang out and BSing with him. He went to Mich. to ride sleds and won't be back till next week. Hope this helps.

Cougar

[riotwarrior]

We'll see, I'm thinking that either a spin on adapter or tapping right into the oiling system to add in a cooler.

[Tomo]

hi
oil cooling as u have mentioned is vitally important
What I have learnt from oil cooling kohlers in demanding situations . This info is applicable to all small engines in the stationary engine category etc .
Oil coolers come in basically three types
plate and fin [with header tanks ] most efficient at cooling
stacked plate [with header tanks ]
tube and fin [serpentine ] , these can suffer large pressure loss very much so in a small engine s

pressure loss thru type of cooler and lines is an issue Use dash 6 or 8 hose and earls fittings etc
the oil pressure u r dealing with is probably around the 45 psi mark [cannot afford to loose much]
the gear pumps on small engines are small so they DO NOT prime the system quickly so cooler size can be limited by this

The best way to plumb the system is
leave the oil filter where it is [increase its size to the largest unit same thread etc ,help with cooling ]
install a sandwich plate with a thermostat and oil cooler connections
This all will help with the pressure build up when starting
A cooler around the 12inch x 10 inch 1 1/2 thick will give good results approx. 18c drop
Use a 10 inch fan 12 v fan
The additional oil capacity will help to keep the oil change interval reasonable 50 -75 hr
eg non turbo diesel 3 quart sump 100 hr oil change less hrs with turbo fitted

use 10/30 oil then 10/40 oil then 15/40 oil u will pick the best 4 your conditions

install cooler with fittings to top so the pump does not have to fill the cooler every start up
On 1 of the cooler fittings allow 4 the oil to be sucked out during service

tomo

[JoeMeg]

An oil cooler is a good thing to have in these applications. I have the stock Kohler system on one engine. That's the factory subplate that goes under the filter to provide the taps to take fluid to the rad. On my Kohler M-18 it's the factory "subplate" for the "remote oil filter" accessory that provides the taps,I just plumbed the cooler inline with the remote filter.

,

However,I still feel that providing unlimited fresh air to the engine cooling air intake is the most significant adaptation that can be done. The hot air will find it's own way out and can be influenced as to where it exits the compartment as well.

,,,

I realize creating the ducting for the engine cooling system you are describing on your Kabota may present some interesting challenges but,I'm sure something can be done. Post some pic's perhaps others will see a way and chime in.

[riotwarrior]

First let me start with this quoted from the manual for the Kubota engine

This cooling system is a natural circulation type composed of a radiator and cooling fan. The water which absorbs heat in cylinder block exchanges with cool water in the upper side of the radiator the hot water is cooled through the radiator core by radiator fins and the fan.

This with NO water pump to speak of and the fact I can hit from -20 Celsius to over +40 Celsius here, I'm really liking the idea of both a transmission and an engine oil cooler added into my setup.

Here is the FAN and Dynamo combination PTO is that stupid pinkish colour shaft which will get turned down to 1" for my clutch, or perhaps a tapered clutch setup...Hmm...I digress..



Open side of rad here and there are small nuts around the edge of tinwork to actually bolt on a shroud of sorts and the oil filter down on bottom right




That gives an idea of what I'm dealing with.

I'm liking the idea of a sandwich/temperature controlled cooler adapter and I'll look into seeing what is available for my size oil filter.

Two coolers one for transmission with a good decent electric pump, and one for the engine with the addition of an electric fan should really help me out in getting this unit to operate safely in summer heat around here.

I found the stock 12hp tecumseh and the transmission got really hot in the summer here hotter than I'd like and so I'm going to gather all the needed parts to assemble a kick ass cooling system

SLOW moving machines with engines in TUBS don't make for good air flow IMHO or cooling for that matter.

Thanks for the suggestions keep em coming!

[Tomo]

hi
use ""Mocal"" thermostat sandwich adapter . Available in the usa .

tomo